Ratchet-drill.



M. STRELCSIK.

RATCHET DRILL.

APPLICATION FILED Dc.8, 1915.

Patented Sept. 12, 1916.

MICHAEL STRELCSIK, OF NEW YORK, N. Y.

RATCHET-DRILL.

Application filed December 8, 1915.

T all whom it may concern Be it known that 1, MICHAEL STRELCSIK, asubject of the King of Hungary, residing at Bronx, in the county ofBronx and State of New York, have invented new and useful Improvementsin Ratchet-Drills, of which the following is a specification.

This invention relates to improvements in mechanism for drilling holes,and particularly to that type adapted to be manually operated, known asratchet drills.

The principal object of the invention is to provide a device which iscapable of being operated in contracted situations and combine therewitha means for forcing the drill at will into the substance in which thehole is desired.

The second object is to provide means for preventing a reverse action ofthe drill head '20 when the ratchet handle is turned backward, andfinally, to provide means whereby the depth of the drill can beaccurately determined.

These and other objects which will be- 25 come more apparent as theexplanation is given, are obtained by the novel construction andcombination of parts hereafter described and shown in the accompanyingdrawings, forming a material part of this 301specification, and in whichFigure 1 is a top plan view of a ratchet drill, showing the applicationof the improvements, parts being broken away in order to save space.Fig. 2 is a side elevation 35 of the same, certain parts being brokenaway in order to disclose the interior. Fig. 3 is a sectional view takenon line 33 of Fig. 2. Fig. 4 is a detail view of the pawl and scaleindex, and Fig. 5 is a fragmental view,

to showing a portion of the side opposite to that seen in Fig. 2.

The construction of the ratchet drill in general is not unlike that ofordinary construction in which the cutting tool, as the M5 drill bit 10is held by the taper shank 11, in the head of drill holder 12 on whichis the ratchet 13 operated by a pawl in an obvious manner as the handle15 is actuated. The casing 16 covers the ratchet wheel and to is held inposition by means of flanges 17 and 18 respectively at the top andbottom of the casing, the flanges being in turn secured by nuts 19 and20 as shown. The upper end 22 of the ratchet body 12 is bored at andscrew-threaded to receive the feed screw 23, the upper end of which isprovided with Specification of Letters Patent.

Patented Sept. 12, 1916.

Serial No. 65,716.

a hardened conical point 24, adapted to bear against any convenientrigid element, providing a thrust for the drill 10. Ordinarily, thescrew 28 is furnished with the squared head or drilled holes, whereby itcan be actuated by a suitable wrench or pin so as to keep the drill 10tightly against the material to be drilled. In these improvements theratchet is rigidly secured to the top of the screw 23 on the squaredportion 26, while below the ratchet is a polygonal surface 27, adaptedto receive the wrench, when relieving the pressure on the drill at suchtimes, as may be required, as at the end of the drill operation.

A casing 16 is shown to extend slightly toward the handle and at eachside thereof near the head, oneof the sides being fitted to receive arod 30 slidably therein, the rod being flattened upon opposite sides,one or both of which may be provided with a scale 31 readable against apointer or index finger 32, secured to the casing 16. At the top of therod 30 is a head 33, comprising the upper and lower flanges 34 havingbetween them a pawl adapted to engage with the ratchet as by meansherewith described. 011 top of the casing 16 is an arm 38 having arecess 39 suited to receive the flattened rod 30, the arm being helddownward in position by means of an' inturned. element formed on theindex 32. The other end of the arm 38 is pivoted at 41 to the link 42,

the opposite end of which is pivotally engaged at 43 with the slidesecured on the upper side of the handle 15 and caused to more by contactwith the lever 46 extending through the opening 47 formed near the endof the slide, the lever being pivoted at 48 and having an arm 49extending downwardly into the handle where it engages with a slot formedin the rod 50 near its end in such manner that as the rod is movedtoward the drill head, the slide will be caused. to move in an oppositedirection and through the link and arm cause the pawl to engage with theteeth of the ratchet 25.

The pin 54 is set in the handle and ex tends through the slot 53 formedin the slide 45 so as to guide it in a straight line as it is operated.In order to prevent the drill from turning backward when the handle ismoved in a direction reverse to that required of forcing the drillagainst the work, a second ratchet is secured to the drill head belowthe end 22, and engaging with it is llO a pawl 61 carried in the casing62 which is held in place by the nut 63 and actuated by the handle 64 inan obvious manner. The position of these handles may be varied to suitthe conditions under which the implement is operated, as extendedoppositely or folded in parallel, one over the other.

In operation, the drill being mounted in its position so that thepointsshall press against the work and the point 24 of the feed screw beset against an appropriate rigid lever or the like against whichsulficient thrust can be obtained, the handle 15 is actuated in theusual manner. hen the drill is rotated sufiiciently to require a furtherfeeding or downward movement, the knob 52 is pressed inwardly, causingthe pawl 35 to engage with the ratchet 25 turning the screw such part ofa revolution as may be desired. When the knob is released, the pawl willbe removed from the ratchet and no further fitting effect to betransmitted. As theratchet wheel 25 is caused to move up and down, theflanges 31 on either side of the pawl 85 is engaged with the sides ofthe ratchet wheel, causing the rod to move'up or down as the case may beand allow a reading to be taken of the index or scale 31when the drillis started; obviously the distance which the drill is entered into thematerial can be readily ascertained.

While the invention is shown as originally incorporated in the apparatusit will be quite evident that the feeding device can be applied toexisting apparatus by mechanics without special difficulty, as can alsothe lever handle and ratchet for preventing a back action of the drill.

Having thus described my invention, what I claim as new and desire tosecure by Let ters Patent is:-

1. In a ratchet drill, the combination with the drill holding body,ratchet and operating means therefor, and a screw for feeding saiddrill, of a ratchet wheel secured to said feed screw, a pawl, a slidingrod upon which said pawl is rigidly mounted, means for maintaining saidpawl in a uniform plane with said ratchet wheel and means for movingsaid pawl laterally into or out of engagement with said ratchet wheel.

2. In a ratchet wheel, the combination with the body, means for rotatingsaid body and a feed screw, of a ratchet wheel rigidly affixed to saidfeed screw, a pawl engageable therewith, a rod upon which said pawl isrigidly n'nn'lnted, a scale fornnal with said rod, an index finger forsaid scale, means for keeping said pawl normally out of en gagement withsaid ratchet and means combined with the handle of said drill forengaging said. pawl with said ratchet.

In testimony whereof I have signed my name to this specification.

MICHAEL STRELCSIK.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patent! Washington, I). C.

